Lemon Pudding Slice and Bake Cookies

Name: Lemon Pudding Slice and Bake Cookies
Prep time: 15 min
Cook time: 10 min
Total time: 40 min
Ingredients: ½ cup unsalted butter (softened); 1 3.4 oz pkg instant lemon pudding mix; ½ cup granulated sugar; 1 large egg; 2 Tbsp 2% milk (any milk works); 1 ½ cup unbleached all-purpose flour; 1 tsp baking powder; ¼ tsp salt